Work dog



c. D. MACK Feb. 20, 1940.

WORK DOG:

'Fi1ed July 9, 1938 FUIIIIIA MMMMWA I INVENTOR. CHARLES 2 MACK %z; j W

ATTORNEY.

angle above the handle I6.

Patented Feb. 20, 1940 Charles D. Mack, Cleveland, Ohio Application July9, 1938, Serial No. 218,426

11 Claims.

This invention relates to work-holders, clamps and vices andparticularly to those tools known as work-dogs used for holding materialduring a grinding, drilling or polishing operation.

An object of the invention is to provide a device that will convenientlygrip round objects of different sizes, and which is easily and quicklyattached or removed from the objectbeing held. Another object of theinvention is to provide a device of this type with an adjustableclamping means which cooperates with a lever operated toggle overthrowcatch.

These and other objects and features of the invention will becomeclearer from the study of the following specification and accompanyingdrawing wherein like parts are designated by like reference charactersand in which:

Figure Us a side view of the device holding a piece of material on amachine;

Figure 2 is a front view of Figure 1;

Figure 3 is a side view of the device only in its open position; p

Figure is a sectional view of the Figure 3 taken along the lines [-4 ofthat figure;

Figure 5 is a side view of a modified form of the device with parts ofthe tool broken away; I Figure 6 is a sectional view of the modifiedform taken along the lines 6-6 of the Figure 5 and Figure. 7 is asectional view of the modified form taken along the lines 'I1 of theFigure 5.

The comprehensive views of the Figures 1 and 2 show a part of anautomatic machine face plate II with its projecting peg I2, its livecenter I3, a piece of material I 4 to be worked upon and the deviceconstituting this invention holding the work in the machine.

The work-dog herein claimed is made of metal. Its elementary partsconsist of a ring or collar I5 to which there is attached or made withthe handle It. The collar I5 has a radial hole I! through it and whichwas'drilled at about a 30 The handle I6 is hollow, has a pair of lateralholes for retaining the pin I9, a small hole in its under side forengaging the tension means 21 and an internally threaded end 28 forengaging an adjusting screw 29.

The lever or cam member I8 is somewhat triangular in shape, is thinenough to fit nicely between the side walls of the handle I6 and has oneof its corners pivoted in the handle by the pin I9 near the collar I5.

A second corner of the cam I8 has a small slot 2| in which there ispivoted the floating pin 22.

This latter pin 22 fits and moves in the aforementioned radial hole I!in accordance with the movement of the cam I8.

There is also pivotally attached to the third corner of the cam I 8 thelever 23 of the toggle mechanism. The lever 23 is bent slightly so that.

its movable fulcrum point 26 may be overthrown or shifted past the linebetween the power and the resistance or as is illustrated here, betweenthe lever handle 25 and the cam 48. When the handles I6 and 25 areseparated as illustrated in the Figure 3 the pin 22 is drawn outwardlyof the radial hole I! in the collar I5; and when they are closed asshown in the Figure l the pin 22 is projected inwardly and into theopening 26 of the said collar. The collar I5and the pin 22 actsubstantially the same as a pair of jaws or like a special vise forgripping material.

A small coil extension spring 28 is attached to the cam I8 and to thehandle It to normally draw the pin 22 outwardly of the collar opening 26so that the said opening is clear for the insertion of new Work therei IThe end 28 of the handle I6 is internally threaded as shown to receivethe externally threaded adjusting bolt 29. lengthwise in the handle andhas a small ball end 30 which engages the cupped end 33 of the arm 32which arm is swivelly connected to the lever 23. Advancing the ball end30 by the turning of the bolt 29; the arm 32, the lever 23, and the camI8 are correspondingly moved forward with the This bolt 29 moves Iresult that the pin 22 is projected further into I the collar opening26. likewise causing the ball end 30 to recede, withdraws the pin 22from the collar I 5. A simple lock nut 3| fixes the position of the ballend 30 so that the work' I4 can be speedily and conveniently handled.Work of different sizes or diameters can be accommodated I by simplyadjusting the bolt 29. j

The modified design illustrated in the Figures 5, 6 and 7 issubstantially the same as the one previously described. Its primarydistinction lies in the floating pin or Wedge 36 in the chordal hole 35which is substituted for the projecting pin 22 in the radial hole IT.The wedge 36 extends clear through the collar I5 and projects outwardlytherefrom for a short distance. The projecting end 31 is convenient forquickly removing the device from the work as a slight tap on that endquickly loosens the wedge.

I The Wedge 36 itself is connected to the cam I8 in the same manner asthe pin 22 is connected to the cam I8. A part of its circumferentialsurface; that part 38 which moves in the collar opening 26 and contactsthe material I4 is ground flat and tapered slightly to give it a properWedge action.

The modified design as illustrated also shows a small leaf type spring2111 for retaining the cam 18 in its normal or open position instead ofthe coil spring 21. Either type of spring is suitable for either styleof device.

The device, while shown in its preferred forms may be modified in othersizes by those skilled in the art. While certain specific terms anddefinite language have been used, it must be understood that theinvention as described is illustrative rather than restrictive, as nolimitations are intended other than those imposed by the scope of theappended claims.

I claim:

1. A work-dog, comprising in combination, a

collar having a chordal hole therein and a handle attached thereto, awedge within the chordal hole, and a tensional adjustable togglemechanism for moving and positioning the said wedge in the said chordalhole.

2. A Work-dog, comprising in combination, a collar having a radial holetherein and a handle attached thereto, a tensioned pin within the radialhole, and an adjustable toggle mechanism attached to the handle formoving and positioning the said pin in the said radial hole.

3. A work-dog, comprising in combination, a collar, a cam attached tothe collar, a pin projecting through the collar operable by the cam, anda toggle mechanism attached to the collar and the cam for operating thesaid pin.

4. A work-dog, comprising in combination, a collar havin a radial holetherein, a cam attached to the collar, a pin projecting through theradial hole fioatingly attached to and operable by the said cam, and atensional adjustable toggle mechanism attached to the collar and the camfor moving and positioning the said pin in the said radial hole.

5. A work-dog, comprising in combination, a collar having a-chordal holetherein and a handle attached to the said collar, a cam attached to thehandle,a tensioned wedge projecting through the hole and fioatinglyattached to the said cam,

and an adjustable toggle mechanism attached to the handle for moving andpositioning the said wedge in the said hole.

6. A work-dog, comprising in combination, a collar having a chordal holetherein, a cam attached to the collar, a wedge projecting through thehole operable by the cam, and a toggle mechanism for moving andpositioning the said wedge in the said hole. I

7. A workdog, comprising in combination, a member substantiallyencircling the work, a handle on the member, a part having a pin hingedthereto, the said pin movable transversely in the said member, and anadjustable toggle mechanism, carried by the handle and operable to movethe said part.

8. A work-dog, comprising in combination, a collar, a handle attached tothe collar, a cam attached to the handle, a pin attached to the cam, andan adjustable toggle mechanism attached to the said handle for operatingthe said cam.

9. A work-dog, comprising in combination, a collar having a holetherein, a handle attached to the collar, a lever attached to thehandle, a pin attached to the lever moveable in the said hole in thecollar, and an adjustable toggle mechanism attached to the said handlefor operating the said lever.

10. A work-dog, comprising in combination, a collar having a handleattached thereto, a lever attached to the handle, a pin floatinglyattached to the lever and moveable within the collar, and an adjustabletoggle mechanism attached to the said handle for operating the saidlever,

11. A work-dog, comprising in combination, a collar having a radial holetherein and a handle attached thereto, a lever attached, to the handle,a pin fioatingly attached to the lever and moveable within the radialhole, and an adjustable toggle mechanism attached to the said handle foroperating the said lever.

' 1 CHARLES D. MACK.

